Beauticians???

Hey, I qualified as a beautician years ago and I can't remember for the life of me If it's safe to tint someone eyebrows whilst they are pregnant.

My best friend is currently 13 weeks and she's wanting them done however I don't want to if there is any risks. I can't imagine it being bad as the products I use has only 3 percent peroxide and is a 1:1 ratio. X